Reg. No. :... Code No. 5023 Name :... Second Year March 2017 Time : 2 Hours Cool-off time : 15 Minutes Part III ELECTRONICS Maximum : 60 Scores General Instructions to Candidates : There is a cool-off time of 15 minutes in addition to the writing time of 2 hrs. You are not allowed to write your answers nor to discuss anything with others during the cool-off time. Use the cool-off time to get familiar with questions and to plan your answers. Read questions carefully before answering. All questions are compulsory and only internal choice is allowed. When you select a question, all the sub-questions must be answered from the same question itself. Calculations, figures and graphs should be shown in the answer sheet itself. Malayalam version of the questions is also provided. Give equations wherever necessary. Electronic devices except non-programmable calculators are not allowed in the Examination Hall. œ Ü Í«Äà : œ ÜÍ û Ì œ ã² µ 15 œ Ý ³à ˆ ý µµ ¹ Ê ¾²¹. ƒ Ì ü š»äà¾ Ì ¹ ² œ, ݲ ª ² «ª œ ¹ œ Ì œ ã ß. Ì Äà ² ²Ò œ ²Ø ü š»äà ½«Î ã³üâ¹ ª ¾ ¹. ß ü š»äྲ¹ Ì ¹ ² ¹. ˆ ² ü š»œøü Ì µ ² Ï µ µç ²Ì² Ç Þ ã ü š»ä ²¹ ü š»œø Þ œ Ò µò µ µç ² ¾Ê. ¾ ³È ² à, ü ½ Äà, ½ ý² à Ò ª Ì ãô Þ µò Ê ¾ ¹. ü š»äà Ì ²¹ œþ ȲÊ. ª ²á ð Ì ª»Äà µ ²¾ ¹. ½ã ½ ² à µüû œ Ì Þ¾² Ý ² à ˆ µ ²á ˆ ² ƒ ½ ã ª²¹ ã ±À Þ ã ¾²ª Ï ã ß. 5023 1 P.T.O.
1. Light propagation through optical fiber is based on the principle of (Score : 1) 2. (a) Explain the structure of an optical fiber with a schematic. (Scores : 3) (b) Mention the basic types of fiber optic cables. 3. Obtain the value of orbital velocity of a satellite. (Given g = 10 ms 2, r = 6 10 6 m) OR 4. What are Geosynchronous Satellites? 5. What is the need for voltage regulator in power supply? 6. Sketch the connection diagram of a voltage regulator for obtaining a fixed stabilized output voltage of 5 V. 7. Mention the main parts of a dish antenna receiver system. 8. Sketch and explain the block diagram of a monochrome TV receiver. (Scores : 4) OR 9. Sketch the fully labelled spectrum of a TV channel and explain the bandwidth of TV transmission. (Scores : 4) 10. Draw the ideal frequency response of a band pass filter. (Score : 1) 11. Mention two conditions to be satisfied for proper operation of a RC differentiator circuit. OR 12. Sketch the output of the following circuit. Explain its working. 5023 2
1. Optical fiber-þ ³ light µ½ã Ô Ï ¼Ì Þ. (Ÿ Ü : 1) 2. (a) ˆ ² optical fiber-µú Œ œ ü ½ Ÿ ¹ ª ª ¾². (Ÿ ÜŸ : 3) (b) Fiber optic cable- ²µ ð œ Äà ² ². (Ÿ ÜŸ : 2) 3. ˆ ² Satellite µú orbital velocity ½ µ Ò œ ÜË ¾². (Given g = 10 ms 2, r = 6 10 6 m) (Ÿ ÜŸ : 2) µßã Þ 4. Geosynchronous Satellites Ò Þ Ð? (Ÿ ÜŸ : 2) 5. ˆ ² power supply-þ voltage regulator-µú ª Ð? (Ÿ ÜŸ : 2) 6. 5 V fixed stabilised output voltage ¾²Ò œ²á ˆ ² voltage regulator-µú connection diagram ª ¾². (Ÿ ÜŸ : 2) 7. ˆ ² Dish antenna receiver Ÿ¹ª œì µú ½ã œ Äà ² ². (Ÿ ÜŸ : 2) 8. ˆ ² Monochrome TV receiver-µú ÿ ¾ ½ ¹ ª Å ª ª ¾². (Ÿ ÜŸ : 4) µßã Þ 9. ˆ ² TV channel µú spectrum ª Å µô ²Ì². TV transmission œ ª Bandwidth ª ª ¾². (Ÿ ÜŸ : 4) 10. ˆ ² Band pass filter-µú ideal frequency response ª ¾². (Ÿ Ü : 1) 11. ˆ ² RC differentiator circuit-µú «½ãªÜÌœÌ œ ª Ê conditions ² ². (Ÿ ÜŸ : 2) µßã Þ 12. µ œ ¾²Ò circuit-µú output ª ¾². µú ½ãªÜÌœ¹ ª ª ¾². (Ÿ ÜŸ : 2) 5023 3 P.T.O.
13. (a) Identify the following wave shaping circuit. (Score : 1) (b) Predict and draw the output of the above circuit for the following input : 14. Flip-flop is a logic circuit. (combinational/sequential). (Score : 1) 15. Sketch the circuit diagram of a JK flip-flop using NAND gates. Give its truth table. 16. The figure below shows the schematic circuit diagram for a 1 bit digital comparator. Name the logic gates G1, G2, G3, G4 and G5 used in this circuit. 5023 4 (Scores : 3) 17. HDMI is the abbreviation for. (Score : 1)
13. (a) µ œþ ¾²Ò wave shaping circuit? (b) (Ÿ Ü : 1) ² Þ Å ¾²Ò circuit µ œ ¾²Ò input-œ» ¾²Ò output ª ¾² : (Ÿ ÜŸ : 2) 14. Flip-flop ˆ ² logic circuit. (combinational/sequential). (Ÿ Ü : 1) 15. ˆ ² JK flip-flop-µú circuit diagram NAND gate ã Å ª ¾². Truth table ² ². (Ÿ ÜŸ : 2) 16. ˆ ² 1 bit digital comparator-µú schematic circuit diagram µ Å ¾²Ò². Þ ã Å ¾²Ò logic gates G1, G2, G3, G4, G5 Ò ª ²µ ã ² à ² ². (Ÿ ÜŸ : 3) 17. HDMI ²µ ã³üë ³ã¹. (Ÿ Ü : 1) 5023 5 P.T.O.
18. Match the following : (1) VGA Port (a) Printer (2) PS/2 Port (b) RJ45 connector (3) USB Port (c) Monitor (4) Internet Port (d) Mouse 19. Compare primary memory and secondary memory. 20. What is the difference between HTTP and HTTPS? 21. is a language used by files in a web server. (Score : 1) 22. Explain the structure of an IPv4 address. (Scores : 3) 23. Give three reasons for establishing the need for modulation. (Scores : 3) 24. A carrier signal has amplitude 5 V and frequency 100 khz. It is amplitude modulated using a message signal having amplitude 3 V and frequency 5 khz. (a) What is the modulation index? (b) What are the side band frequencies? (c) What is the bandwidth required for this AM signal? (Scores : 3) 25. What are sky waves? 26. Define critical frequency. (Score : 1) 27. What is sampling? 28. Draw the FSK modulated signal for the digital data 10110011. 29. Explain TDMA. 30. GPS is a constellation of number of satellites. (Score : 1) 31. Explain GPRS. (Scores : 3) 5023 6
18. ü ²¹ã üü¾² : (1) VGA Port (a) Printer (2) PS/2 Port (b) RJ45 connector (3) USB Port (c) Monitor (4) Internet Port (d) Mouse (Ÿ ÜŸ : 2) 19. Primary memory- ²¹ secondary memory- ²¹»¹ µüû². (Ÿ ÜŸ : 2) 20. HTTP- ²¹ HTTPS- ²¹ Ù Þ ª»» Ÿ¹ Ð? (Ÿ ÜŸ : 2) 21. Files web server-þ ã ¾²Ò ˆ ². (Ÿ Ü : 1) 22. ˆ ² IPv4 address-µú Œ œ ª ª ¾². (Ÿ ÜŸ : 3) 23. Modulation-µú ª ð ã ¾²Ò ³Ò Äà ² ². (Ÿ ÜŸ : 3) 24. ˆ ² Amplitude modulated wave-µú carrier signal amplitude 5 V, ½ý± ¼ÏŸ 100 khz. Message signal amplitude 3 V ½ý± ¼ÏŸ 5 khz. (a) Modulation index ½? (b) Side band frequency- à µ µ¾? (c) ƒ AM signal-œ ª bandwidth ½? (Ÿ ÜŸ : 3) 25. Sky waves Ò Þ Ð? (Ÿ ÜŸ : 2) 26. Critical frequency œ Üâü ¾². (Ÿ Ü : 1) 27. Sampling Ò Þ Ð? (Ÿ ÜŸ : 2) 28. 10110011 Ò ÝÞ Ý ²µ FSK modulated signal ª ¾². (Ÿ ÜŸ : 2) 29. TDMA ª ª ¾². (Ÿ ÜŸ : 2) 30. GPS ˹, Ÿ Ý µµ ݲ ²µ ˆ ² constellation. (Ÿ Ü : 1) 31. GPRS ª ª ¾². (Ÿ ÜŸ : 3) 5023 7 P.T.O.
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